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Product details

Parameters

Vs (Min) (V) 4 Vs (Max) (V) 40 Operating temperature range (C) 0 to 70 open-in-new Find other Frequency converters

Package | Pins | Size

PDIP (P) 8 93 mm² 9.81 x 9.43 open-in-new Find other Frequency converters

Features

  • Ensured Linearity 0.01% Maximum
  • Improved Performance in Existing Voltage-to-
    Frequency Conversion Applications
  • Split or Single-Supply Operation
  • Operates on Single 5-V Supply
  • Pulse Output Compatible With All Logic Forms
  • Excellent Temperature Stability: ±50 ppm/°C
    Maximum
  • Low Power Consumption: 15 mW Typical at 5 V
  • Wide Dynamic Range, 100 dB Minimum at 10-kHz
    Full Scale Frequency
  • Wide Range of Full Scale Frequency:
    1 Hz to 100 kHz
  • Low-Cost
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Description

The LMx31 family of voltage-to-frequency converters are ideally suited for use in simple low-cost circuits for analog-to-digital conversion, precision frequency-to-voltage conversion, long-term integration, linear frequency modulation or demodulation, and many other functions. The output when used as a voltage-to-frequency converter is a pulse train at a frequency precisely proportional to the applied input voltage. Thus, it provides all the inherent advantages of the voltage-to-frequency conversion techniques, and is easy to apply in all standard voltage-to-frequency converter applications.

Further, the LMx31A attain a new high level of accuracy versus temperature which could only be attained with expensive voltage-to-frequency modules. Additionally the LMx31 are ideally suited for use in digital systems at low power supply voltages and can provide low-cost analog-to-digital conversion in microprocessor-controlled systems. And, the frequency from a battery-powered voltage-to-frequency converter can be easily channeled through a simple photo isolator to provide isolation against high common-mode levels.

The LMx31 uses a new temperature-compensated band-gap reference circuit, to provide excellent accuracy over the full operating temperature range, at power supplies as low as 4 V. The precision timer circuit has low bias currents without degrading the quick response necessary for 100-kHz voltage-to-frequency conversion. And the output are capable of driving 3 TTL loads, or a high-voltage output up to 40 V, yet is short-circuit-proof against VCC.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet LMx31x Precision Voltage-to-Frequency Converters datasheet (Rev. C) Sep. 29, 2015
Technical articles Remembering Bob Pease Jun. 18, 2014
Application notes AN-240 Wide-Range Current-to-Frequency Converters (Rev. B) Apr. 29, 2013
Application notes Versatile Monolithic V/Fs can Compute as Well as Convert with High Accuracy (Rev. B) Apr. 29, 2013
Application notes AN-265 An Electronic Watt-Watt-Hour Meter (Rev. B) Apr. 26, 2013
Application notes New Phase-Locked-Loops Have Advangs as Freq to Voltage Cnvrtrs (Rev. B) Apr. 26, 2013
Application notes AN-311 Theory and Applications of Logarithmic Amplifiers (Rev. B) Apr. 23, 2013
Application notes AN-C V/F Converter ICs Handle Frequency-to-Voltage Needs (Rev. B) Apr. 23, 2013
Application notes An Acoustic Transformer Powered Super-High Isolation Amplifier Oct. 04, 2004
Application notes 2-Way Multiplexed LCD Drv & Low Cost ADC Using V/F Tech w/COP8 Microcontrollers May 14, 2004
Application notes Freq-to-Vltg Converter Uses Sample-and-Hold to Improve Response & Ripple Oct. 03, 2002

Design & development

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PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
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SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
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Reference designs

REFERENCE DESIGNS Download
Comparator with Hysteresis Reference Design
TIPD144 This TI Verified Design implements a comparator with hysteresis.  Comparators are used to differentiate between two different signal levels.  For example, a comparator may differentiate between an over temperature and normal temperature condition.  Noise or signal variation at the (...)
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